CN116990897B - Polarizer, preparation method thereof and display panel - Google Patents

Abstract

The application provides a polaroid, a preparation method thereof and a display panel, wherein the polaroid comprises a polarizing film and a protective layer arranged on one side of the polarizing film, one side of the protective layer away from the polarizing film is provided with a concave-convex structure, and the concave-convex structure comprises a plurality of concave-convex sub surfaces with different shapes and/or sizes; according to the application, the concave-convex structure is arranged on the side, far away from the polarizing film, of the protective layer, so that light rays emitted to the polarizer can be uniformly scattered based on the diffuse reflection principle when passing through the concave-convex structure, and light intensity energy of each wavelength is uniformly dispersed when the uniformly scattered light rays pass through the protective layer again, thereby avoiding the occurrence of rainbow patterns and relieving the problem of rainbow patterns of the existing display device.

Description

Polarizer and preparation method thereof, display panel

Technical field

The present application relates to the field of display technology, and in particular to a polarizer, a preparation method thereof, and a display panel.

Background technique

With the rapid development of liquid crystal display technology, LCD screens have become a mainstream product in the display field, from the initial application of small-size mobile phone screens to the wide application of large-size computer and TV screens. Therefore, the market has higher requirements for the image quality and environmental adaptability of displays.

The structure of the LCD display is mainly composed of two glass substrates with a layer of liquid crystal sandwiched between them. From bottom to top, they are the backlight, the light guide plate, the lower polarizer, the lower glass substrate, the thin film transistor array, the liquid crystal layer, and the color filter. , upper glass substrate, upper polarizer. The light source emitted by the backlight is diffused through the light guide plate, and then passes through the polarizer with the absorption axis 90° on the lower side (vertical to the paper facing outward). The 90° component of the natural light is absorbed and becomes polarized parallel to the 0° direction (horizontal parallel to the plane of paper) linearly polarized light. When there is no change in the electric field, the liquid crystal molecules do not deflect, and the polarization direction of the emitted linearly polarized light does not change and is absorbed by the polarizer in the 0° direction of the upper absorption axis. No light is transmitted, and it appears in a dark state. When the current passes through the transistor and the electric field changes, the liquid crystal molecules are deflected, and the polarization direction of the horizontal linearly polarized light becomes vertical linearly polarized light, which passes through the upper polarizer without being absorbed and appears in a bright state. In addition, the upper glass is bonded to the color filter. Based on the principle of colorimetry, each pixel is composed of three sub-pixels RGB. These sub-pixels that emit red, blue and green colors are mixed and transmitted to the human eye, thus forming a colorful display screen.

In the working principle of display devices, polarizers play a vital role in optical switching. Their basic components are base material protective layer, polarizing layer, liquid crystal compensation layer, pressure-sensitive (Pressure Sensitive Adhesive, PSA) glue, and release film. . In the long-term application process, polarizers whose base material protective layer is polyethylene terephthalate (PET) base material are used. Due to the crystallization characteristics of the PET material, a birefringence effect is formed, which easily causes the display to appear. Rainbow pattern phenomenon.

Contents of the invention

This application provides a polarizer, a preparation method thereof, and a display panel to alleviate the technical problem of rainbow streaks in existing display devices.

In order to solve the above problems, the technical solutions provided by this application are as follows:

An embodiment of the present application provides a polarizer, which includes:

polarizing film;

A protective layer, arranged on one side of the polarizing film;

Wherein, a side of the protective layer away from the polarizing film is provided with a concave-convex structure, and the concave-convex structure includes a plurality of concave-convex sub-surfaces with different shapes and/or sizes.

In the polarizer provided by the embodiment of the present application, the polarizer further includes a light-adjusting film disposed on a side of the protective layer away from the polarizing film, and one side of the light-adjusting film has the concave-convex structure.

In the polarizer provided by the embodiment of the present application, the side of the dimming film away from the protective layer has the concave-convex structure; the dimming film includes a base material layer and a third layer dispersed in the base material layer. A diffusion particle, at least part of the first diffusion particle protrudes from the surface of the side of the dimming film away from the protective layer, forming the concave-convex structure.

In the polarizer provided by the embodiment of the present application, the side of the dimming film close to the protective layer has the concave-convex structure; the dimming film includes a base material layer and a third layer dispersed in the base material layer. A diffusion particle, at least part of the first diffusion particle protrudes from the surface of the side of the dimming film close to the protective layer, forming the concave and convex structure.

In the polarizer provided by the embodiment of the present application, the dimming film further includes second diffusion particles dispersed in the base material layer, and the second diffusion particles and the first diffusion particles protrude from the On the same side surface of the dimming film, some of the first diffusion particles are located on the side of the second diffusion particles away from the concave and convex structure.

In the polarizer provided by the embodiment of the present application, the particle size of the first diffusion particles is larger than the particle size of the second diffusion particles.

In the polarizer provided by the embodiment of the present application, the base material layer includes an ultraviolet curable resin base material, the first diffusion particles include polymethyl methacrylate particles, and the second diffusion particles include silica particles. , at least one of titanium dioxide particles and zinc dioxide particles.

In the polarizer provided in the embodiment of the present application, the haze range of the polarizer is 20% to 70%.

In the polarizer provided by the embodiment of the present application, the angle between the normal line of the concave and convex subsurface and the plane parallel to the plane of the protective layer is distributed in the range of 0 degrees to 180 degrees.

Embodiments of the present application also provide a polarizer preparation method, which includes:

Attach a protective layer to one side of the polarizing film;

A concave-convex structure is prepared on the side of the protective layer away from the polarizing film. The concave-convex structure includes a plurality of concave-convex sub-surfaces with different shapes and/or sizes.

In the polarizer preparation method provided in the embodiment of the present application, the step of preparing a concave-convex structure on the side of the protective layer away from the polarizing film includes:

Mix the ultraviolet light curable resin, ultraviolet light curable monomer, and first diffusion particles in a solvent to form a dimming solution;

Coating the dimming solution on the side of the protective layer away from the polarizing film;

The light-switching solution is cured to form the light-switching film, and the concave-convex structure is formed on one side of the light-switching film.

In the polarizer preparation method provided by the embodiment of the present application, the dimming solution further includes second diffusion particles, and the particle size of the second diffusion particles is smaller than the particle size of the first diffusion particles; the second diffusion particles The particles include inorganic silica particles with a particle diameter of 30 nanometers to 70 nanometers, and the first diffusion particles include polymethylmethacrylate particles with a particle diameter of 2 micrometers to 3 micrometers.

In the polarizer preparation method provided in the embodiment of the present application, the mass fraction of the first diffusing particles and the second diffusing particles in the dimming solution ranges from 2.5% to 20%, wherein the first The ratio of the diffusing particles to the second diffusing particles is 7:3.

An embodiment of the present application also provides a display panel, which includes the polarizer of one of the foregoing embodiments or the polarizer prepared by the polarizer preparation method of one of the foregoing embodiments.

The beneficial effects of this application are: in the polarizer, its preparation method, and the display panel provided by this application, the polarizer includes a polarizing film and a protective layer. The protective layer is arranged on one side of the polarizing film, and the protective layer is away from the polarizing film. One side of the polarizing film is provided with a concave-convex structure, and the concave-convex structure includes a plurality of concave-convex sub-surfaces with different shapes and/or sizes; in this application, the concave-convex structure is provided on the side of the protective layer away from the polarizing film so that the light emitted toward the polarizer can When light passes through the concave and convex structure, based on the principle of diffuse reflection, the light will be evenly dispersed. When the evenly dispersed light passes through the protective layer again, the light intensity energy of each wavelength will be evenly dispersed, thus avoiding the occurrence of rainbow streaks and solving the problem. Existing display devices have technical problems such as the rainbow pattern phenomenon.

Description of the drawings

In order to explain the embodiments or technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the purpose of invention. For some embodiments, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic cross-sectional structural diagram of a polarizer provided by an embodiment of the present application.

FIG. 2 is a detailed structural diagram of the dimming film provided by the embodiment of the present application.

FIG. 3 is a schematic cross-sectional structural diagram of a display panel provided by an embodiment of the present application.

FIG. 4 is another schematic cross-sectional structural diagram of a display panel provided by an embodiment of the present application.

FIG. 5 is another schematic cross-sectional structural diagram of a display panel provided by an embodiment of the present application.

FIG. 6 is a schematic diagram of light propagation when the display panel does not include a dimming film according to an embodiment of the present application.

FIG. 7 is a schematic diagram of light propagation when the display panel includes a dimming film according to an embodiment of the present application.

FIG. 8 is a schematic flow chart of a polarizer preparation method provided by an embodiment of the present application.

Detailed ways

The following description of the embodiments refers to the accompanying drawings to illustrate specific embodiments in which the present application may be implemented. The directional terms mentioned in this application, such as [upper], [lower], [front], [back], [left], [right], [inner], [outer], [side], etc., are for reference only. The direction of the attached schema. Therefore, the directional terms used are used to explain and understand the present application, rather than to limit the present application. In the figure, units with similar structures are represented by the same numbers. In the drawings, the thickness of some layers and regions are exaggerated for clarity of understanding and ease of description. That is, the size and thickness of each component shown in the drawings are arbitrarily shown, but the application is not limited thereto.

In response to the problem of rainbow streaks in existing display devices, the inventor of this application discovered during research that: due to the crystallization characteristics of the polyethylene terephthalate (PET) in the polarizer, after being stretched into a film Anisotropy is produced, and a birefringence effect occurs when light passes through PET. When white light passes through the PET material, the material has selective light transmission properties. The light transmittance of different wavelengths is different. The light transmittance of the 500nm band is low, while the transmittance of the 450nm and 600nm bands is high, resulting in the rainbow pattern phenomenon. occur.

To this end, this application provides a polarizer, a preparation method thereof, and a display panel to solve the above problems.

Please refer to Figures 1 to 3. Figure 1 is a schematic cross-sectional structural diagram of the polarizer provided by the embodiment of the present application. Figure 2 is a detailed structural diagram of the dimming film provided by the embodiment of the present application. Figure 3 is a schematic diagram of the detailed structure of the dimming film provided by the embodiment of the present application. A schematic diagram of the cross-sectional structure of the display panel is provided. Referring to FIG. 1 , the polarizer 20 includes a protective layer 21 and a polarizing film 22 . The protective layer 21 is provided on one side of the polarizing film 22 . A concave-convex structure 301 is provided on the side of the protective layer 21 away from the polarizing film 22 . The concave-convex structure 301 includes a plurality of concave-convex sub-surfaces 310 with different shapes and/or sizes.

In this embodiment, the concave-convex structure 301 is provided on the side of the protective layer 21 away from the polarizing film 22, so that when the light rays directed to the polarizer 20 pass through the concave-convex structure 301, the light will be dispersed evenly based on the principle of diffuse reflection. When the uniformly dispersed light passes through the protective layer 21 of the polarizer 20 again, the light intensity energy of each wavelength is evenly dispersed, thereby avoiding the occurrence of rainbow streaks and solving the technical problem of rainbow streaks in existing display devices.

Optionally, continuing to refer to FIG. 1 , the polarizer 20 further includes a light-adjustable film 30 disposed on the side of the protective layer 21 away from the polarizing film 22 , and one side of the light-adjustable film 30 has the concave and convex surfaces. Structure 301. That is, the concave and convex structure 301 located on the side of the protective layer 21 away from the polarizing film 22 is formed by the light modulating film 30 . The dimming film 30 can be directly prepared on the protective layer 21 of the polarizer 20 , or directly attached to the protective layer 21 of the polarizer 20 .

The light modulating film 30 has a concave and convex structure 301 , and the concave and convex structure 301 is located on a side of the light modulating film 30 away from the protective layer 21 . The concave-convex structure 301 includes a plurality of irregular concave-convex sub-surfaces 310, and the plurality of concave-convex sub-surfaces 310 have different shapes and/or sizes. The irregularity in the irregular plurality of uneven sub-surfaces 310 means that the shape and arrangement of each uneven sub-surface 310 have no fixed rules, for example, the shapes and/or sizes of each uneven sub-surface 310 are different. The size may refer to the height of the uneven sub-surface from the protective layer 21 and the area of the uneven sub-surface 310 , etc.

The structure of the dimming film 30 will be described in detail below:

Referring to FIGS. 1 and 2 , the dimming film 30 includes a base material layer 31 and first diffusion particles 32 dispersed in the base material layer 31 . At least part of the first diffusion particles 32 is formed from the dimming film 30 . The side surface of the film 30 away from the protective layer 21 protrudes to form the concave-convex structure 301 .

Further, the dimming film 30 further includes second diffusion particles 33 dispersed in the base material layer 31 , the second diffusion particles 33 and the first diffusion particles 32 protrude from the dimming film. 30, some of the first diffusion particles 32 are located on the side of the second diffusion particles 33 away from the concave and convex structure 301. The ratio of the first diffusion particles 32 and the second diffusion particles 33 is 7:3.

The particle size of the second diffusion particles 33 is smaller than the particle size of the first diffusion particles 32. For example, the particle size of the first diffusion particles 32 ranges from 2 microns to 3 microns, such as 2 microns, 2.1 microns, and 2.2 microns. microns, 2.6 microns, 2.8 microns, 3 microns, etc.; the particle size range of the second diffusion particles 33 is 30 nanometers to 70 nanometers, such as 30 nanometers, 40 nanometers, 50 nanometers, 60 nanometers, 70 nanometers, etc. Optionally, the first diffusion particles 32 include polymethylmethacrylate (PMMA) particles, etc., and the second diffusion particles 33 include silica particles, titanium dioxide particles, zinc dioxide particles, and other particles. At least one. The base material layer 31 includes a UV-curable resin base material, such as an epoxy acrylate oligomer or a polyurethane acrylic oligomer with a molecular weight ranging from several hundred to tens of thousands.

The first diffusion particles 32 and the base material layer 31 belong to different substances and will not mix with each other in the same system, so that the first diffusion particles 32 are randomly distributed in the base material layer 31. Some of the first diffusion particles 32 are distributed on the side of the base material layer 31 away from the protective layer 21 , and will protrude from the surface of the dimming film 30 away from the protective layer 21 , forming the following formation. The concave and convex structure 301 is formed; and some of the first diffusion particles 32 are distributed on the side of the base material layer 31 close to the protective layer 21 and will be completely wrapped by the base material layer 31 . Since the distribution positions of the first diffusion particles 32 and the numbers distributed at different positions are random and not fixed, the concave and convex structure 301 formed by the dimming film 30 is also irregular.

Similarly, the second diffusion particles 33 and the base material layer 31 also belong to different substances and will not blend with each other in the same system, so that the second diffusion particles 33 in the base material layer 31 are also Randomly distributed, some of the second diffusion particles 33 are distributed on the side of the base material layer 31 away from the protective layer 21 , and will move away from the dimming film 30 just like the first diffusion particles 32 . One side surface of the protective layer 21 is protruded to form the concave and convex structure 301 . Moreover, the distribution positions of the second diffusion particles 33 and the numbers distributed at different positions are also random and not fixed, so that the concave and convex structure 301 formed by the dimming film 30 is also irregular.

The density of the first diffusion particles 32 is greater than the density of the second diffusion particles 33 , so that the first diffusion particles 32 are easier to deposit than the second diffusion particles 33 , that is, the first diffusion particles The number of particles 32 far away from the concave-convex structure 301 is greater than the number of second diffusion particles 33 far away from the concave-convex structure 301, so that some of the first diffusion particles 32 are located far away from the second diffusion particles 33. One side of the concave-convex structure 301.

In addition, the particle size of the first diffusion particles 32 is larger than the particle size of the second diffusion particles 33, making it easier for the second diffusion particles 33 to gather on the surface of the base material layer 31 to form a large cluster structure. To form the concave and convex structure 301. Moreover, since the particle size of the second diffusion particles 33 is smaller, more shapes of the concave and convex structures 301 can be formed through the aggregation of a plurality of the second diffusion particles 33, so that the second diffusion particles 33 can Cooperate with the first diffusion particles 32 to better form the irregular concave-convex structure 301. At the same time, by using the cooperation of the first diffusion particles 32 and the second diffusion particles 33, when the polarizer 20 is applied to a display panel, the subjective effect of the dark picture of the display panel is bluish, thereby improving the visual quality. Subjective feelings.

The uneven structure 301 is composed of a plurality of uneven sub-surfaces 310. The plurality of uneven sub-surfaces 310 are spliced and combined together to form the uneven structure 301. The irregular uneven structure 301 is composed of a plurality of irregular irregular surfaces. The concave and convex sub-surface 310 is composed of. The irregular state of the uneven sub-surface 310 can be measured by the angle between the normal line of the uneven sub-surface 310 and a plane parallel to the plane where the protective layer 21 is located, such as the normal line of the uneven sub-surface 310 The angle between the plane parallel to the plane where the protective layer 21 is located is distributed in the range of 0 degrees to 180 degrees. Specifically, a straight line parallel to the plane where the protective layer 21 is located can be taken as a reference line, and the reference line is defined as a horizontal line. As shown in Figure 2, H represents the horizontal line, and ON represents the uneven sub-surface. The normal line TL of 310 represents the tangent line of the concave-convex sub-surface 310, the normal line ON is perpendicular to the tangent line TL, and a is the angle between the normal line ON of the concave-convex sub-surface 310 and the horizontal line H. The angle a between the normal line ON of the concave and convex subsurface 310 and the horizontal line H has a distribution between 0 degrees and 180 degrees. For example, the angle a includes 0 degrees, 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees, 70 degrees, 80 degrees, 90 degrees, 100 degrees, 110 degrees, 120 degrees, 130 degrees, 140 degrees, 150 degrees, 160 degrees, 170 degrees, 180 degrees and other integer angles, of course the included angle a can also include non-integer angles, such as 33.6 degrees, 62.8 degrees, 121.9 degrees, etc.

Further, the haze of the polarizer 20 ranges from 20% to 70%, such as 20%, 30%, 40%, 50%, 60%, 70%, etc. The haze of the polarizer 20 is mainly determined by the state of the concave and convex structure 301 on the dimming film 30, so the haze of the polarizer 20 can be used as a measure of the concavity and convexity of the dimming film 30. Another indicator of the irregular state of structure 301. The haze of the polarizer 20 refers to the percentage of the emitted light rays that deviate from an angle of more than 2.5° to the total transmitted light intensity among the emitted light rays of the polarizer 20 .

It should be noted that in this embodiment, the dimming film includes the first diffusion particles 32 and the second diffusion particles 33 dispersed in the base material layer 31 as an example. However, this application It is not limited thereto. In the dimming film 30 of the present application, more or fewer types of diffusion particles can be provided in the base material layer 31 . For example, one or three types of diffusion particles can be provided in the base material layer 31 . , 4 types, 5 types and other diffusion particles. In one embodiment, one type of diffusion particles is provided in the base material layer 31, such as the first diffusion particles 32. The first diffusion particles 32 have a larger particle size and are easier to form the uneven structure. 301, and the required haze parameters of the polarizer 20 can be more conveniently adjusted according to the number of particles. In addition, since the particle diameter of the first diffusion particles 32 is larger, it is easier to form the concave and convex structure 301. Therefore, when the dimming film 30 includes the first diffusion particles 32 and the second diffusion particles, When two kinds of diffusion particles are used, the number of the first diffusion particles 32 can be greater than the number of the second diffusion particles 33. For example, the ratio of the first diffusion particles 32 to the second diffusion particles 33 is 7: 3.

The above-mentioned polarizer 20 can be applied to a display panel, including a liquid crystal display panel, etc. The embodiment of the present application takes the display panel as a liquid crystal display panel as an example.

Specifically, referring to FIG. 3 , the display panel 100 includes a backlight module 10 and a liquid crystal cell 40 arranged opposite to the backlight module 10 . The polarizer 20 is disposed on the side of the liquid crystal cell 40 close to the backlight module 10 , and the dimming film 30 is disposed on the side of the protective layer 21 close to the backlight module 10 . Of course, the display panel 100 further includes an upper polarizer 50 located on the side of the liquid crystal cell 40 away from the backlight module 10 .

The backlight module 10 includes a backlight source 11 , a back plate 12 , and an optical film such as a diffusion film 13 . The backlight source 11 is fixed on the back plate 12 , and the diffusion film 13 is disposed in the light emitting direction of the backlight source 11 . The back plate 12 can be made of metal, such as iron or other metals. Of course, the back plate 12 can also be made of alloy. In some other examples of this embodiment, the back plate 12 can also be made of plastic. Of course, an outer frame formed by a combination of plastic and metal is also feasible, such as a plastic-iron integrated frame that is currently widely used.

The backlight 11 includes LED, mini LED and other light-emitting light sources. The diffusion film 13 is mainly used to emit the light emitted by the backlight source 11 uniformly at various angles to increase the display uniformity of the display panel 100 . Of course, the backlight module 10 may also include a reflective sheet disposed between the backlight source 11 and the back plate 12 . The reflective sheet is mainly used to increase the light utilization rate of the backlight source 11 , thereby increasing the overall efficiency of the backlight source 11 . The brightness and energy efficiency of the display panel 100 are described.

The liquid crystal cell 40 includes an array substrate 41 and an opposite substrate 42 arranged oppositely, and a liquid crystal layer 43 arranged between the array substrate 41 and the opposite substrate 42 .

The polarizer 20 is disposed on the side of the liquid crystal cell 40 close to the backlight module 10, and the dimming film 30 is disposed on the side of the protective layer 21 close to the backlight source 11, so that the The concave-convex structure 301 on the dimming film 30 is located on the side of the dimming film 30 close to the backlight 11 . The polarizer 20 further includes a compensation layer 23 and an adhesive layer 24 laminated on the side of the polarizing film 22 away from the protective layer 21 . The protective layer 21 is made of polyethylene terephthalate (PET). The protective layer 21 is used to protect the polarizing film 22 and prevent the polarizing film 22 from being corroded by water and oxygen. The material of the polarizing film 22 includes polyvinyl alcohol (PVA), and the material of the adhesive layer 24 is preferably pressure sensitive adhesive (PSA). The polarizer 20 is pasted on one side of the array substrate 41 of the liquid crystal cell 40 through the adhesive layer 24 .

The upper polarizer 50 has the same structure as the polarizer 20 , but the upper polarizer 50 does not include the light modulating film 30 . The upper polarizer 50 can be pasted on one side of the opposite substrate 42 of the liquid crystal cell 40 through an adhesive layer on the upper polarizer 50 .

In one embodiment, please refer to FIGS. 1 to 4 . FIG. 4 is another schematic cross-sectional structural diagram of a display panel provided by an embodiment of the present application. Different from the above embodiment, in the display panel 101 of this embodiment, the side of the dimming film 30 close to the protective layer 21 has the concave-convex structure 301; the dimming film 30 includes a base The material layer 31 and the first diffusion particles 32 dispersed in the base material layer 31, at least part of the first diffusion particles 32 protrude from the surface of the side of the dimming film 30 close to the protective layer 21, forming The concave and convex structure 301.

Optionally, the dimming film 30 may further include a substrate 34, and the substrate layer 31 is provided on a side of the substrate 34 close to the protective layer 21. The substrate 34 may be a glass substrate or the like. Of course, the dimming film 30 of the present application may not include the substrate 34. For example, after the dimming film 30 is prepared on the substrate 34, the dimming film 30 and the protective layer may be combined. 21, and remove the base 34. Please refer to the above embodiment for other descriptions, which will not be described again here.

In one embodiment, please refer to FIGS. 1 to 7 . FIG. 5 is another sectional structural diagram of a display panel provided by an embodiment of the present application. FIG. 6 is a display panel provided by an embodiment of the present application that does not include dimming. 7 is a schematic diagram of the propagation of light when the display panel provided by the embodiment of the present application includes a dimming film. Different from the above embodiment, in the display panel 102 of this embodiment, the backlight module 10 further includes a quantum dot film 14 and a brightness enhancement film 15, as shown in FIG. 5 .

The quantum dot film 14 is disposed in the light emitting direction of the backlight 11 , the diffusion film 13 is disposed on a side of the quantum dot film 14 away from the back plate 12 , and the brightness enhancement film 15 is disposed on the side of the backlight 11 . The diffusion film 13 is on the side away from the back plate 12 . Of course, the present application is not limited to this. The quantum dot film 14 of the present application can also be disposed between the diffusion film 13 and the brightness enhancement film 15, or be disposed away from the brightness enhancement film 15. one side of the diffusion film 13.

By arranging the quantum dot film 14 and cooperating with the Mini LED backlight source 11, QD-Mini LED backlight technology can be used. The QD-Mini LED backlight technology can use local dimming to achieve regional light control, achieving ultra-high brightness. The contrast ratio improves the color gamut of the display panel 102 .

Referring to Figure 6, however, since the QD-Mini LED backlight technology is equipped with the brightness enhancement film 15 added to the backlight module 10, the light emitted from the backlight source 11 is linearly polarized light. Linearly polarized light When passing through the protective layer 21 of the polarizer 20 , since the PET of the protective layer 21 has birefringence characteristics, the linearly polarized light will change its polarization state after passing through the PET and become elliptically polarized light or circularly polarized light. , and after light of different wavelengths passes through PET, it forms emitted light of different polarization states. When light of different wavelengths passes through the polarizing film 22, the light intensity energy that the light of different wavelengths can emit is different, resulting in a difference in light intensity energy and a large difference in light transmittance, which in turn aggravates the rainbow pattern phenomenon. . In particular, the light intensity of the QD-Mini LED backlight in the 620 nm to 700 nm band will be stronger than the traditional D65 light source. Combined with the birefringence characteristics of PET itself, the transmitted light intensity in the red light band will be more, causing human eyes Visual red rainbow pattern phenomenon.

The polarizer 20 of the present application can well solve the problem of QD-Mini LED backlight technology by disposing the dimming film 30 with a concave and convex structure 301 on the side of the protective layer 21 close to the backlight source 11 . The rainbow pattern phenomenon.

Specifically, referring to FIG. 7 , after the light emitted from the backlight 11 passes through the quantum dot film 14 , when the light passes through the irregular concave-convex structure 301 of the dimming film 30 , based on the principle of diffuse reflection, the light will be Diffusion, the concave-convex structure 301 can turn linearly polarized light into partially polarized light, so that the light emitted from the dimming film 30 is no longer linearly polarized light, and the light will be evenly dispersed, effectively diffusing the light intensity energy. , making the light intensity energy distribution of the light emitted from the light modulating film 30 more uniform. When the partially polarized light emitted from the dimming film 30 passes through the protective layer 21 , the polarization state will not change. When light of different wavelengths passes through the polarizing film 22 , light of different wavelengths can emit. The light intensity and energy are the same, so that the light intensity energy of each wavelength is evenly dispersed, thereby overcoming the occurrence of rainbow streaks.

It should be noted that Figures 6 and 7 only illustrate the propagation direction of light and the light state after the light passes through different film layers. In order to clearly show the propagation direction and light state of the light after passing through different film layers, they are simply shown. The approximate positional relationship of each film layer is shown, which does not represent the actual film layer structure. In addition, the arrowed lines in Figures 6 and 7 represent the propagation direction of the light, and the inclined lines, circles and ellipses represent the state of the light. Please refer to the above embodiment for other descriptions, which will not be described again here.

Based on the same inventive concept, embodiments of the present application also provide a polarizer preparation method. The polarizer preparation method can be used to prepare the polarizer of one of the above embodiments. The polarizer prepared by the polarizer preparation method can be used In the display panel of one of the above embodiments. Specifically, please refer to FIGS. 1 to 8 . FIG. 8 is a schematic flow chart of a method for preparing a polarizer according to an embodiment of the present application. Referring to Figure 8, the polarizer preparation method includes the following steps:

S201: Attach the protective layer 21 to one side of the polarizing film 22;

Specifically, referring to FIGS. 1 and 3 , the protective layer 21 is attached to one side of the polarizing film 22 , and the compensation layer 23 and the adhesive layer are attached to the side of the polarizing film 22 away from the protective layer 21 . Layer 24. The protective layer 21 is made of polyethylene terephthalate. The protective layer 21 is used to protect the polarizing film 22 and prevent the polarizing film 22 from being corroded by water and oxygen. The material of the polarizing film 22 includes polyvinyl alcohol (PVA), and the material of the adhesive layer 24 is preferably pressure sensitive adhesive (PSA).

S202: Prepare an uneven structure 301 on the side of the protective layer 21 away from the polarizing film 22. The uneven structure 301 includes a plurality of uneven sub-surfaces 310 with different shapes and/or sizes.

Specifically, the step of preparing a concave-convex structure 301 on the side of the protective layer 21 away from the polarizing film 22 includes:

The ultraviolet light curable resin, the ultraviolet light curable monomer, the first diffusion particles 32 and the second diffusion particles 33 are mixed in a solvent to form a dimming solution. More specifically, ultraviolet light curable resin, ultraviolet light curable monomer, first diffusion particles 32, second diffusion particles 33, photoinitiator and other auxiliary agents are mixed in a solvent to form the dimming solution.

Wherein, the ultraviolet curable resin includes, for example, epoxy acrylate oligomers or polyurethane acrylic oligomers with molecular weights ranging from several hundred to tens of thousands. The ultraviolet curable monomer includes at least one of trimethylolpropane triacrylate (TMPTA), pentaerythritol triacrylate (PETA), dipentaerythritol glycerol (DPHA), and the like.

The photoinitiator includes at least one of benzophenone photoinitiator, thioxanthone photoinitiator, etc., and the proportion of the photoinitiator is 1% to 4%. Other additives include thickeners, leveling agents, antistatic agents, etc. The proportion of other additives is 0.1% to 1%. The thickener is used to adjust the viscosity of the product, the leveling agent is used to improve the appearance of the product, and the antistatic agent is used to reduce the surface resistance of the coating. The solvents include ketone solvents, alcohol solvents, lipid solvents, ether solvents, etc.

The first diffusion particles 32 include polymethyl methacrylate particles with a particle size of 2 to 3 microns, and the second diffusion particles 33 include inorganic silica particles and titanium dioxide particles with a particle size of 30 to 70 nanometers. , zinc dioxide particles and other particles. The mass fraction of the first diffusion particles 32 and the second diffusion particles 33 in the dimming solution ranges from 2.5% to 20%. If the first diffusion particles 32 and the second diffusion particles 33 The proportion is small, and the haze effect of the formed light-adjusting film 30 is poor, which further causes the formed polarizer 20 to have a poor haze effect, affecting the effect of overcoming the rainbow pattern; if the first diffusion particles 32 and the The second diffusion particles 33 occupy a large proportion. When the formed polarizer 20 is applied to the display panel 100 , the light will be diffused too much, resulting in a decrease in the contrast and transmittance of the display panel 100 . Optionally, the ratio of the first diffusion particles 32 and the second diffusion particles 33 is 7:3.

Coat the dimming solution on the side of the protective layer 21 away from the polarizing film 22;

Specifically, a coating process such as wet coating is used to coat the dimming solution on the side of the protective layer 21 away from the polarizing film 22 .

The dimming solution is cured to form a dimming film, and the concave and convex structure 301 is formed on one side of the dimming film. Specifically, the dimming solution coated on one side of the protective layer 21 is cured, so that the ultraviolet curable resin forms the base material layer 31, the first diffusion particles 32 and the second diffusion particles. 33 are dispersed in the base material layer 31, and at least some of the first diffusion particles 32 protrude from the side surface of the base material layer 31 away from the protective layer 21 to form the concave and convex structure 301. The second diffusion particles 33 and the first diffusion particles 32 protrude from the same side surface of the base material layer 31 , and part of the first diffusion particles 32 is located on the side of the second diffusion particles 33 away from the concave-convex structure 301 One side to form the light modulating film 30, as shown in FIG. 2 .

In another embodiment, in step S202, the step of preparing a concave-convex structure 301 on the side of the protective layer 21 away from the polarizing film 22 can also be implemented by the following method:

The light etching process etches the side of the protective layer 21 away from the polarizing film 22 to form the concave and convex structure 301 . That is, by etching directly on one side of the protective layer 21 , the concave-convex structure 301 is directly formed on the protective layer 21 . Please refer to the above embodiment for other descriptions, which will not be described again here.

In another embodiment, in step S202, the step of preparing a concave-convex structure 301 on the side of the protective layer 21 away from the polarizing film 22 can also be implemented by the following method:

Referring to FIG. 4 , the dimming solution is applied on the substrate 34 and solidified to form a dimming film 30 . The concave-convex structure 301 is formed on the side of the dimming film 30 away from the substrate 34 . Specifically, the dimming solution coated on one side of the substrate 34 is cured, so that the ultraviolet curable resin forms the base material layer 31 , the first diffusion particles 32 and the second diffusion particles 33 Dispersed in the base material layer 31, at least some of the first diffusion particles 32 protrude from the side surface of the base material layer 31 away from the base 34 to form the concave and convex structure 301, and the second The diffusion particles 33 and the first diffusion particles 32 protrude from the same side surface of the base material layer 31 , and part of the first diffusion particles 32 is located on the side of the second diffusion particles 33 away from the concave-convex structure 301 , to form the light modulating film 30, as shown in FIG. 4 .

After the light modulating film 30 is formed, the light modulating film 30 is attached to the side of the protective layer 21 away from the polarizing film 22 . Of course, the dimming film 30 of the present application may not include the substrate 34. For example, after the dimming film 30 is prepared on the substrate 34, the dimming film 30 and the protective layer may be combined. 21, and remove the base 34.

According to the above embodiments, it can be known that:

The present application provides a polarizer, a preparation method thereof, and a display panel. The polarizer includes a polarizing film, a protective layer and a dimming film. The protective layer is arranged on one side of the polarizing film, and the dimming film is arranged away from the protective layer. On one side of the polarizing film, the dimming film has a concave-convex structure, and the concave-convex structure includes a plurality of concave-convex sub-surfaces with different shapes and/or sizes; in this application, the protective layer is provided with concave-convex structures on the side away from the polarizing film. The structured light-emitting film causes the light directed toward the polarizer to pass through the concave-convex structure of the light-emitting film. Based on the principle of diffuse reflection, the light will be evenly dispersed. When the evenly dispersed light passes through the protective layer again, the light of each wavelength will The light intensity energy is evenly dispersed, thereby avoiding the occurrence of rainbow streaks and solving the technical problem of rainbow streaks in existing display devices.

In the above embodiments, each embodiment is described with its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

The embodiments of the present application have been introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; this field Those of ordinary skill should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions in this application. The scope of the technical solutions of each embodiment.

Claims (13)

1. A polarizer, comprising:

a polarizing film; and

a protective layer disposed on one side of the polarizing film, the material of the protective layer including polyethylene terephthalate;

wherein, one side of the protective layer far away from the polarizing film is provided with a concave-convex structure, and the concave-convex structure comprises a plurality of concave-convex sub-surfaces with different shapes and/or sizes; the haze range of the polaroid is 20-70%, and when light rays are emitted to the polaroid, the light rays pass through the concave-convex structure and then pass through the protective layer.

2. The polarizer of claim 1, further comprising a light modulation film disposed on a side of the protective layer remote from the polarizing film, wherein a side of the light modulation film has the concave-convex structure.

3. The polarizer of claim 2, wherein a side of the light modulation film remote from the protective layer has the concave-convex structure;

the light adjusting film comprises a substrate layer and first diffusion particles dispersed in the substrate layer, and at least part of the first diffusion particles protrude from the surface of one side of the light adjusting film away from the protective layer to form the concave-convex structure.

4. The polarizer of claim 2, wherein the light modulation film has the concave-convex structure on a side near the protective layer;

the light adjusting film comprises a substrate layer and first diffusion particles dispersed in the substrate layer, and at least part of the first diffusion particles protrude from the surface of one side of the light adjusting film, which is close to the protective layer, so that the concave-convex structure is formed.

5. The polarizer of claim 3 or 4, wherein the light modulation film further comprises second diffusion particles dispersed in the substrate layer, the second diffusion particles protruding from the same side surface of the light modulation film as the first diffusion particles, at least a portion of the first diffusion particles being located on a side of the second diffusion particles away from the relief structure.

6. The polarizer of claim 5, wherein the first diffusing particles have a particle size greater than a particle size of the second diffusing particles.

7. The polarizer of claim 6, wherein the substrate layer comprises an ultraviolet light curable resin substrate, the first diffusion particles comprise polymethyl methacrylate particles, and the second diffusion particles comprise at least one of silica particles, titania particles, and zinc dioxide particles.

8. The polarizer of claim 1, wherein the angles between the normals of the plurality of concave-convex sub-surfaces and a plane parallel to the plane of the protective layer are all distributed in a range of 0 degrees to 180 degrees.

9. A method for manufacturing a polarizer, comprising:

attaching a protective layer on one side of the polarizing film, wherein the material of the protective layer comprises polyethylene terephthalate; and

preparing a concave-convex structure on one side of the protective layer far away from the polarizing film to form a polarizer, wherein the concave-convex structure comprises a plurality of concave-convex sub-surfaces with different shapes and/or sizes; the haze range of the polaroid is 20-70%, and when light rays are emitted to the polaroid, the light rays pass through the concave-convex structure and then pass through the protective layer.

10. The method of preparing a polarizer according to claim 9, wherein the step of preparing a concave-convex structure on a side of the protective layer away from the polarizing film comprises:

mixing ultraviolet light curing resin, ultraviolet light curing monomer and first diffusion particles in a solvent to form a dimming solution;

coating the dimming solution on one side of the protective layer away from the polarizing film;

and curing the dimming solution to form a dimming film, wherein one side of the dimming film forms the concave-convex structure.

11. The method of preparing a polarizer according to claim 10, wherein the dimming solution further comprises second diffusion particles having a smaller particle size than the first diffusion particles; the second diffusion particles comprise inorganic silica particles having a particle size of 30 nm to 70nm, and the first diffusion particles comprise polymethyl methacrylate particles having a particle size of 2 microns to 3 microns.

12. The method of preparing a polarizer according to claim 11, wherein the mass fraction of the first and second diffusion particles in the dimming solution ranges from 2.5% to 20%, wherein the ratio of the first and second diffusion particles is 7:3.

13. A display panel comprising a polarizer according to any one of claims 1 to 8 or a polarizer produced by the method of producing a polarizer according to any one of claims 9 to 12.